Container and pump system

Abstract

To provide a container capable of preventing gas from leaking from a hole for cable penetration.SOLUTION: Hollow containers 3, 4 are disposed above a hollow column 2 provided around a liquefied gas pump P. A cable 8 for mounting / drawing the liquefied gas pump P is penetrated into the central parts of the containers 3, 4 from below to above. The containers 3, 4 include: lower plate members 5, 6 having cable penetration holes 9, 10 allowing the cable 8 to be penetrated in the central parts; and a stuffing box member 12 disposed around the cable penetration holes 9, 10 in the central parts of the lower plate members 5, 6, and having a cable insertion hole 13 allowing the cable 8 to be inserted in the central part. The stuffing box member 12 includes opening diameter adjusting mechanisms 14, 20 for adjusting a size of an opening diameter of the cable insertion hole 13.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a container and a pump system. [Background technology]

[0002] Among liquefied gas pumps, conventional liquefied natural gas (LNG) pumps deal with the problem of LNG leaking to the outside by placing a temporary plate on the flange at the top of the column (see, for example, Patent Document 1). Since LNG is heavier than air in the low temperature range, it is not released into the atmosphere. On the other hand, in the case of cryogenic fluids such as liquefied hydrogen and liquefied ammonia, the specific gravity of the gasified gas is lighter than air, so there is a risk that liquefied hydrogen or liquefied ammonia will be released.

[0003] When performing maintenance on a liquefied hydrogen pump, the boiling point of liquefied hydrogen is -253°C, whereas air (mainly oxygen and nitrogen) liquefies and freezes at temperatures in the -253°C range. When air liquefies, liquid oxygen is produced, which poses the risk of explosion, and when air freezes, both nitrogen and oxygen pose the risk of damaging the pump. In addition, when performing maintenance on a liquefied ammonia pump, ammonia is toxic if it leaks outside, which could pose a health hazard to humans. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2018-80801 A Summary of the Invention [Problem to be solved by the invention]

[0005] In order to prevent air from entering or the liquid (liquefied hydrogen, liquefied ammonia, etc.) from being released to the outside during maintenance of the liquefied gas pump, when pulling up the cryogenic pump, or when installing the cryogenic pump, a partitioned chamber such as a buffer container that is installed on the column surrounding the liquefied gas pump and forms a barrier zone, or a purge container that is installed on the buffer container, is required.

[0006] The bulkhead room is equipped with a door to separate the inside from the atmosphere side or the tank side, but because the cable (wire) for installing and extracting the liquefied gas pump passes through the inside of the bulkhead room, there was a problem of gas leaking through the cable pass-through hole.

[0007] In the case of a liquid hydrogen pump, it is not possible to fully prevent nitrogen and oxygen from entering the column, and in the case of an ammonia pump, ammonia gas leaks out to the top and outside. Furthermore, since the diameter of the cable is not uniform and accessories such as shackles and links are attached, the hole in the door needs to be larger than the diameter of the cable. As mentioned above, it has been extremely difficult to prevent gas leakage from the cable penetration hole in the past.

[0008] The present invention has been made in consideration of the above problems, and has an object to provide a container and a pump system that can prevent gas from leaking from a cable pass-through hole. [Means for solving the problem]

[0009] The container of the present invention is a hollow container provided above a hollow column provided around a liquefied gas pump, and a cable for installing and extracting the liquefied gas pump passes through the center of the container from the bottom to the top of the container, and the container comprises: a lower plate member provided at the bottom of the container and having a cable through hole in the center through which the cable can pass; and a stuffing box member provided in the center of the lower plate member around the cable through hole and having a cable insertion hole in the center through which the cable is inserted, and the stuffing box member is provided with an opening diameter adjustment mechanism that adjusts the size of the opening diameter of the cable insertion hole.

[0010] According to this configuration, a stuffing box member is provided around the cable through hole, and the stuffing box member is provided with an opening diameter adjustment mechanism that adjusts the opening diameter of the cable insertion hole. Therefore, by adjusting the opening diameter of the cable insertion hole using the opening diameter adjustment mechanism of the stuffing box member, it is possible to reduce gas leaking from the cable through hole.

[0011] In addition, in the container of the present invention, the opening diameter adjustment mechanism may include a rotating ring member rotatable around the central axis of the cable insertion hole, a pair of upper and lower linear ring members respectively provided on the upper and lower sides of the rotating ring member and slidable along the central axis of the cable insertion hole, and a pair of upper and lower cloth members for each of the pair of upper and lower linear ring members, both ends of which are fixed to the linear ring member and the rotating ring member and are provided to cover the linear ring member and the rotating ring member, and a pair of upper and lower cable insertion holes are formed by the pair of upper and lower cloth members, and by rotating the rotating ring member, the size of the opening diameter of the pair of upper and lower cable insertion holes may be adjusted simultaneously.

[0012] According to this configuration, the opening diameter adjustment mechanism is configured by the rotating ring member, the pair of upper and lower linear motion ring members, and the cloth member, and the pair of upper and lower cable insertion holes are formed by the pair of upper and lower cloth members. Then, by rotating the rotating ring member, the opening diameters of the pair of upper and lower cable insertion holes can be adjusted simultaneously.

[0013] In the container of the present invention, the rotating ring member may be provided with a gas inlet for allowing a purge gas to flow into the inside of the rotating ring member.

[0014] According to this configuration, the purge gas can be introduced into the interior of the rotating ring member through the gas inlet provided in the rotating ring member. The purge gas that has flowed into the interior of the rotating ring member flows upward and downward inside the rotating ring member. As a result, even if gas attempts to flow downward from above the linear motion ring member above the rotating ring member, the inflow of gas can be prevented by the purge gas flowing upward. Also, even if gas attempts to flow upward from below the linear motion ring member below the rotating ring member, the inflow of gas can be prevented by the purge gas flowing downward.

[0015] In the container of the present invention, the rotating ring member, the linear motion ring member and the fabric member may each be splittable into two from a closed ring state to an open ring state.

[0016] According to this configuration, since the rotary ring member and the linear ring member can be split into two, the opening diameter adjustment mechanism can be attached to the cable from the middle of the cable by changing the ring from an open state to a closed state inside the container. Also, the opening diameter adjustment mechanism can be removed from the cable from the middle of the cable by changing the ring from a closed state to an open state.

[0017] In addition, in the container of the present invention, the opening diameter adjustment mechanism may include an annular main body member having the cable insertion hole in a central portion, a pair of left and right plate-shaped sealing members that are openable and closable on the upper and lower sides of the main body member, and a spring member that urges each of the pair of left and right sealing members in a direction to close them toward the central portion, and the cable insertion hole may be formed in the central portion of the pair of left and right sealing members, and the size of the opening diameter of the cable insertion hole may be adjusted by moving the pair of left and right sealing members in an opening direction against the elastic force of the spring member.

[0018] According to this configuration, the opening diameter adjustment mechanism is formed by the main body member, the seal member, and the spring member, and the cable insertion hole is formed in the center of the pair of left and right seal members. Then, by moving the pair of left and right seal members in the opening direction against the elastic force of the spring member, the opening diameters of the pair of upper and lower cable insertion holes can be adjusted simultaneously.

[0019] In the container of the present invention, the main body member may be provided with a gas inlet for allowing a purge gas to flow into the inside of the main body member.

[0020] According to this configuration, the purge gas can be made to flow into the inside of the main body member through the gas inlet provided in the main body member. The purge gas that has flowed into the inside of the main body member flows upward and downward inside the main body member. As a result, even if gas attempts to flow in from the upper side of the main body member (from above to below), the inflow of the gas can be prevented by the purge gas flowing toward the upper side. Also, even if gas attempts to flow in from the lower side of the main body member (from below to above), the inflow of the gas can be prevented by the purge gas flowing toward the lower side.

[0021] In the container of the present invention, the main body member may be split into two in a direction in which the pair of left and right seal members open.

[0022] According to this configuration, since the main body member can be split into two, the opening diameter adjustment mechanism can be attached to the cable from the midpoint of the cable inside the container, or the opening diameter adjustment mechanism can be detached from the cable from the midpoint of the cable.

[0023] The container of the present invention may also include a glove box provided inside the container and configured to allow a user to insert his or her hand from outside the container to operate the stuffing box member, and a work window positioned near the glove box and the stuffing box member so that the glove box and the stuffing box member can be viewed from outside the container.

[0024] According to this configuration, when performing maintenance on the liquefied gas pump, a user can insert their hand from outside the container into the glove box inside the container (purging container) and adjust the size of the opening diameter of the cable insertion hole using the opening diameter adjustment mechanism of the stuffing box member, thereby reducing the amount of gas leaking from the cable pass-through hole.

[0025] The pump system of the present invention includes a liquefied gas pump and any of the containers described above.

[0026] In this pump system, as in the above-mentioned container, a stuffing box member is provided around the cable through hole, and the stuffing box member is provided with an opening diameter adjustment mechanism for adjusting the opening diameter of the cable insertion hole. Therefore, by adjusting the opening diameter of the cable insertion hole using the opening diameter adjustment mechanism of the stuffing box member, it is possible to prevent gas from leaking from the cable through hole. Effect of the Invention

[0027] According to the present invention, it is possible to prevent gas from leaking from the cable pass-through hole. [Brief description of the drawings]

[0028] [Figure 1] FIG. 1 is an explanatory diagram (side view) showing a pump system according to an embodiment of the present invention. [Diagram 2] FIG. 1 is an explanatory diagram (perspective view) showing a pump system according to an embodiment of the present invention. [Diagram 3] FIG. 2 is an explanatory diagram (side view) showing a stuffing box according to an embodiment of the present invention. [Figure 4] FIG. 2 is an explanatory diagram (side view) showing a stuffing box according to an embodiment of the present invention. [Diagram 5] FIG. 2 is an explanatory diagram (plan view) showing a stuffing box according to the embodiment of the present invention. [Figure 6] FIG. 2 is an explanatory diagram (plan view) showing a stuffing box according to the embodiment of the present invention. [Figure 7] FIG. 4 is an explanatory diagram (side view) showing an inflow of a purge gas in the embodiment of the present invention. [Figure 8] FIG. 13 is an explanatory diagram (side view) showing a stuffing box according to another embodiment. [Figure 9] FIG. 13 is an explanatory diagram (side view) showing a stuffing box according to another embodiment. [Figure 10] FIG. 13 is an explanatory diagram (plan view) showing a stuffing box according to another embodiment. [Figure 11] FIG. 13 is an explanatory diagram (plan view) showing a stuffing box according to another embodiment. [Figure 12] FIG. 13 is an explanatory diagram (side view) showing a pump system according to another embodiment. [Figure 13] FIG. 13 is an explanatory view (perspective view) showing a pump system according to another embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0029] Hereinafter, a container according to an embodiment of the present invention will be described with reference to the drawings. In this embodiment, a container used in a pump system or the like equipped with a liquefied gas pump for delivering a cryogenic liquefied gas such as liquefied hydrogen or liquefied ammonia will be described as an example.

[0030] The configuration of a container according to an embodiment of the present invention will be described with reference to the drawings. FIGS. 1 and 2 are explanatory diagrams showing a pump system according to the present embodiment. As shown in FIGS. 1 and 2, the pump system 1 includes a liquefied gas pump P. Here, the liquefied gas pump P in one embodiment is a pump for cryogenic liquefied gas, such as a liquid hydrogen pump or a liquefied ammonia pump. The pump system 1 further includes a hollow column 2 provided around the liquefied gas pump P, a hollow buffer container 3 provided on the upper part of the column 2, and a hollow purge container 4 provided above the column 2 and on the upper part of the buffer container 3. Here, the buffer container 3 and the purge container 4 are collectively referred to as a "container". This container is hollow and provided above the hollow column 2 provided around the liquefied gas pump P.

[0031] The buffer container 3 includes a buffer lower plate 5 that is provided on the lower surface of the buffer container 3 and can be opened and closed upward. The purge container 4 includes a container lower plate 6 that is provided on the lower surface of the purge container 4 and can be opened and closed upward, and a container upper plate 7 that is provided on the upper surface of the purge container 4 and can be opened and closed upward.

[0032] A cable 8 for installing and extracting the liquefied gas pump P passes through the center of the container from the bottom to the top. The buffer lower plate 5 has a cable through hole 9 through which the cable 8 can pass, the container lower plate 6 has a cable through hole 10 through which the cable 8 can pass, and the container upper plate 7 has a cable through hole 11 through which the cable 8 can pass. A stuffing box 12 is provided around the cable through hole 9 in the center of the buffer lower plate 5. A stuffing box 12 is provided around the cable through hole 10 in the center of the container lower plate 6. A stuffing box 12 is provided around the cable through hole 11 in the center of the container upper plate 7.

[0033] 12 and 13, the container 3 may include a glove box 30 configured to allow a user to insert his or her hand from outside the buffer container 12 in order to operate the stuffing box 12, and an access window 31 disposed near the glove box 30. The stuffing box 12 and the glove box 30 inside the buffer container 3 can be viewed from outside the buffer container 3 through the access window 31.

[0034] Furthermore, in this pump system 1, the purge container 4 includes a glove box 32 configured to allow a user to insert his or her hand from outside the purge container 4 in order to operate the stuffing box 12, and an access window 33 disposed near the glove box 32. The stuffing box 12 and the glove box 32 of the purge container 4 are visible from outside the purge container 4 through the access window 33.

[0035] In this case, when operating the opening diameter adjustment mechanism of the stuffing box 12 for maintenance of the liquefied gas pump, it is not necessary to open the container to put one's hand inside the container. Therefore, it is possible to prevent air from entering the barrier zone and the liquid from leaking out of the partition chamber (container) to the outside, which are caused by putting one's hand inside the partition chamber (container) as in the conventional case.

[0036] In addition, in the container of the present invention, the buffer container 4 may be provided with a second glove box 34 configured to allow a user to insert his / her hand from outside the container to perform manual work inside the container, and a second work window 35 arranged near the second glove box 34 so that the inside of the buffer container 4 can be viewed from outside the buffer container.

[0037] With this configuration, when performing maintenance on the liquefied gas pump, a user can insert his / her hands from outside the container into the second glove box 32 inside the container to perform work inside the container. In this case, when performing manual work inside the container for maintenance of the liquefied gas pump, it is not necessary to open the container to insert a person's hand inside the container. Therefore, it is possible to prevent air from entering the barrier zone and the liquid from leaking out of the container to the outside, which are caused by inserting a person's hand into the container as in the conventional case.

[0038] The maintenance method for a liquefied gas pump according to the present invention includes the steps of a user inserting his / her hand from outside the container into a glove box 30, 32, 34 provided inside the container, and operating the opening diameter adjustment mechanism of the stuffing box 12 provided inside the container to suspend the liquefied gas pump.

[0039] With this maintenance method, like the above container, there is no need to open the container to put one's hand inside when operating the opening diameter adjustment mechanism of the stuffing box 12 for maintenance of the liquefied gas pump. Therefore, it is possible to prevent air from entering the barrier zone and the liquid from leaking out of the container, which are caused by putting one's hand inside the container as in the conventional case.

[0040] 3 to 7 are explanatory diagrams showing a stuffing box 12 of this embodiment. A cable insertion hole 13 through which the cable 8 is inserted is provided in the center of the stuffing box 12. The stuffing box 12 is provided with an opening diameter adjustment mechanism 14 that adjusts the size of the opening diameter of the cable insertion hole 13.

[0041] 3 and 4, the opening diameter adjustment mechanism 14 includes a rotary ring 15 that is rotatable around the central axis of the cable insertion hole 13, and a pair of upper and lower linear motion rings 16 that are provided above and below the rotary ring 15 and are slidable along the central axis of the cable insertion hole 13. Both ends of each of the pair of upper and lower linear motion rings 16 are fixed to the linear motion ring 16 and the rotary ring 15, and a pair of upper and lower cloths 17 are provided cylindrically so as to cover the periphery of the linear motion ring 16 and the rotary ring 15. The pair of upper and lower cloths 17 form a pair of upper and lower cable insertion holes 13.

[0042] It is desirable for the material of the pair of upper and lower cloths 17 to be flexible, airtight, and resistant to fraying or surface chipping at extremely low temperatures. Table 1 below shows the results of tests conducted to confirm the flexibility, airtightness, and presence or absence of fraying or surface chipping at extremely low temperatures for four materials (materials A to D).

[0043] [Table 1]

[0044] Here, para-aramid fiber "Kevlar (registered trademark)" manufactured by Toray DuPont Co., Ltd. was used as material A. Furthermore, "Silicone-coated heat-resistant sheet flame retardant KW-031" manufactured by Kikuchi Sheet Kogyo Co., Ltd. was used as material B. Furthermore, "Double-sided silicone-coated synthetic heat-resistant sheet" manufactured by Kikuchi Sheet Kogyo Co., Ltd. was used as material C. Furthermore, "Achilles Frigo Soft cold-resistant sheet for partitions" manufactured by Achilles Corporation was used as material D.

[0045] The test specimens of materials A to D were immersed in liquid nitrogen and cooled sufficiently, and then removed from the liquid nitrogen and twisted. Then, it was visually confirmed whether the flexibility of the test specimens was maintained and whether there were any defects such as chips or frays on the surface of the test specimens. In addition, the airtightness of the test specimens was confirmed by a simple gas test (for example, a test in which a test device is divided into two rooms by each material, one room is filled with a specific gas and the other room is filled with air, and after leaving it for a certain period of time, the increase in the gas concentration in the other room is measured). From the results in Table 1, it was found that it is desirable to use material B or material C as the material for the pair of upper and lower cloths 17.

[0046] The rotating ring 15 is provided with a rotating lever 18, and the size of the opening diameter of the pair of upper and lower cable insertion holes 13 can be adjusted at the same time by inserting a hand from the glove box and operating the rotating lever 18 to rotate the rotating ring 15. In this case, by applying a rotational motion to one end of the cylindrically arranged cloth 17 by the rotating lever 18, the cloth 17 is twisted, the diameter of the cylinder is narrowed, and as a result, the cloth 17 can be tightly attached to the outer periphery of the cable 8. Therefore, the cloth 17 clings to the cable 8 for installation and extraction, narrowing the gas flow path and making it possible to suppress gas leakage. In addition, when the cable 8 is moved up and down, such as when the liquefied gas pump P is stored under the column 2 or when the liquefied gas pump P is pulled up and removed from under the column 2, the cloth 17 is untwisted by applying a rotational motion in the opposite direction to the twisting direction by the rotating lever 18, and the diameter of the cylinder is widened, resulting in a space being created between the outer periphery of the cable 8 and the cloth 17. Therefore, the installation / pulling cable 8 can be moved up and down without interfering with the cloth 17. In this way, the opening diameter adjustment mechanism 14 not only adjusts the degree of constriction according to the diameter of the cable 8, but also changes the opening diameter according to the work, making it possible to open and close repeatedly.

[0047] 5 and 6, the rotating ring 15, the linear motion ring 16, and the cloth 17 can each be split into two, from a closed state to an open state. This makes it possible to attach and detach the stuffing box 12 with the cable 8 passing through the container. Also, by adjusting the degree of squeezing according to the diameter of the cable 8, leakage can be suppressed even for cables 8 with locally different diameters.

[0048] As shown in Figs. 3 to 4 and 7, the rotary ring 15 is provided with a gas inlet 19 for introducing a purge gas into the rotary ring 15. For example, nitrogen gas or helium gas is used as the purge gas. As shown in Fig. 7, the purge gas flows from the inside of the stuffing box 12 to the upper part and from the inside of the stuffing box 12 to the lower part, which has the effect of preventing the flow of gas falling from the upper part to the lower part of the container and the effect of preventing the flow of gas leaking from the lower part to the upper part of the container. Therefore, it is possible to prevent the leakage of highly dangerous gases such as ammonia and hydrogen to the outside and the falling of air and nitrogen into the column 2.

[0049] In this case too, by operating the rotation lever 18 depending on whether the cable 8 is not moving or is moving up and down, the space between the outer periphery of the cable 8 and the cloth 17 can be closed or opened to an appropriate interval, so that the flow rate passing through that space can be adjusted appropriately and the wasteful use and release of a large amount of purge gas can be prevented.

[0050] According to the container of this embodiment, a stuffing box 12 is provided around the cable through holes 9, 10, and 11, and the stuffing box 12 is provided with an opening diameter adjustment mechanism 14 that adjusts the size of the opening diameter of the cable insertion hole 13. Therefore, by adjusting the size of the opening diameter of the cable insertion hole 13 using the opening diameter adjustment mechanism 14 of the stuffing box 12, it is possible to reduce gas leaking from the cable through hole.

[0051] In this embodiment, the opening diameter adjustment mechanism 14 is configured by the rotating ring 15, the pair of upper and lower linear motion rings 16, and the cloth 17, and the pair of upper and lower cable insertion holes 13 are formed by the pair of upper and lower cloths 17. Then, by rotating the rotating ring 15, the opening diameters of the pair of upper and lower cable insertion holes 13 can be adjusted simultaneously.

[0052] In this embodiment, a purge gas can be introduced into the interior of the rotary ring 15 from a gas inlet 19 provided in the rotary ring 15. The purge gas that has flowed into the interior of the rotary ring 15 flows upward and downward inside the rotary ring 15. As a result, even if gas attempts to flow downward from above the linear ring 16 on the upper side of the rotary ring 15, the inflow of gas can be prevented by the purge gas flowing upward. Also, even if gas attempts to flow upward from below the linear ring 16 on the lower side of the rotary ring 15, the inflow of gas can be prevented by the purge gas flowing downward.

[0053] In addition, in this embodiment, the rotating ring 15, the linear motion ring 16, and the cloth 17 can be split into two, so that by changing the state of the rings from an open state to a closed state inside the container, the opening diameter adjustment mechanism 14 can be attached to the cable 8 at the intermediate portion of the cable 8. Also, by changing the state of the rings from a closed state to an open state, the opening diameter adjustment mechanism 14 can be removed from the cable 8 at the intermediate portion of the cable 8.

[0054] In addition, the containers (buffer container 3, purge container 4) of this embodiment may be provided with a glove box 30 provided inside the container and configured to allow a user to insert their hands from outside the container to operate the stuffing box 12, and a work window 31 arranged near the glove box 30 and stuffing box 12 so that the glove box 30 and stuffing box 12 can be viewed from outside the container.

[0055] According to this configuration, when performing maintenance on the liquefied gas pump, a user can insert his or her hand from outside the container into the glove box 30 inside the container (purge container 3) and adjust the size of the opening diameter of the cable insertion hole 13 using the opening diameter adjustment mechanism 14 of the stuffing box 12, thereby reducing the amount of gas leaking from the cable pass-through hole.

[0056] Although the embodiments of the present invention have been described above by way of example, the scope of the present invention is not limited to these, and changes and modifications can be made according to the purpose within the scope of the claims.

[0057] (Other embodiments) For example, Fig. 8 to Fig. 11 show another example of the opening diameter adjustment mechanism 20. As shown in Fig. 8 to Fig. 11, the opening diameter adjustment mechanism 20 may include an annular main body 21 having a cable insertion hole 13 in the center, and a pair of left and right plate-shaped seal members 22 that are provided on the upper and lower sides of the main body 21 so as to be openable and closable. In this case, the cable insertion hole 13 is formed in the center of the pair of left and right seal members 22, and the pair of left and right seal members 22 are biased in a direction to close toward the center by the elastic force of a pressing spring 23. Then, the pair of left and right seal members 22 move in the opening direction against the elastic force of the pressing spring 23, so that the size of the opening diameter of the cable insertion hole 13 can be adjusted.

[0058] In this case, as shown in Figures 8 and 9, by providing tapered portions 25, 26 on the link 24 attached to the cable 8 and the seal material 22, respectively, the opening diameter of the cable insertion hole 13 can be changed simply by lifting and lowering the cable 8, improving workability. Also, the main body 21 of the opening diameter adjustment mechanism 20 is provided with a gas inlet 19 for introducing a purge gas into the main body 21. Furthermore, the main body 21 of the opening diameter adjustment mechanism 20 can be split into two in the direction in which the pair of left and right seal materials 22 open.

[0059] In this other embodiment as well, the opening diameter adjustment mechanism 20 is configured by the main body 21, the seal material 22, and the pressing spring 23, and the cable insertion hole 13 is formed in the center of the pair of left and right seal materials 22. Then, by moving the pair of left and right seal materials 22 in the opening direction against the elastic force of the pressing spring 23, the opening diameters of the pair of upper and lower cable insertion holes 13 can be adjusted simultaneously.

[0060] In this case, the purge gas can be made to flow into the main body 21 from the gas inlet 19 provided in the main body 21. The purge gas that has flowed into the main body 21 flows upward and downward inside the main body 21. As a result, even if gas attempts to flow in from the upper side of the main body 21 (from above to below), the inflow of the gas can be prevented by the purge gas flowing toward the upper side. Also, even if gas attempts to flow in from the lower side of the main body 21 (from below to above), the inflow of the gas can be prevented by the purge gas flowing toward the lower side.

[0061] Also in this case, since the main body 21 of the opening diameter adjustment mechanism 20 can be split into two, the opening diameter adjustment mechanism 20 can be attached to the cable 8 at the middle part of the cable 8 inside the container, or the opening diameter adjustment mechanism 20 can be detached from the cable 8 at the middle part of the cable 8. [Industrial Applicability]

[0062] INDUSTRIAL APPLICABILITY As described above, the container according to the present invention has the effect of preventing gas leakage from the cable pass-through hole, and is useful as a pump system equipped with a liquefied gas pump that delivers extremely low temperature liquefied gas such as liquefied hydrogen or liquefied ammonia. [Explanation of symbols]

[0063] 1. Pump System 2 Column 3 Buffer Container (Container) 4 Purge Container (Container) 5 Buffer lower plate (lower plate component) 6 Container lower plate (lower plate component) 7 Container Upper Plate 8 Cable 9 Cable Through Hole 10 Cable Through Hole 11 Cable Through Hole 12 Stuffing box (stuffing box component) 13 Cable insertion hole 14 Opening diameter adjustment mechanism 15 Rotating Ring 16 Linear motion ring 17 Cloth 18 Rotation lever 19 Gas inlet 20 Opening diameter adjustment mechanism 21 Main unit 22 Sealing material 23 Compression spring 24 Links 25 Tapered section 26 Tapered section 30 Glove Box 31 Working window 32 Glove box 33 Working window 34 Glove box 35 Working window P Liquefied Gas Pump

Claims

1. A hollow container provided above a hollow column provided around a liquefied gas pump, and a cable for installing and extracting the liquefied gas pump is passed through a center portion of the container from the bottom to the top of the container, The container comprises: a lower plate member provided at a lower portion of the container and having a cable through hole at a center portion through which the cable can pass; a stuffing box member provided around the cable through hole in a central portion of the lower plate member, the stuffing box member having a cable insertion hole in the central portion through which the cable is inserted; Equipped with The stuffing box member is provided with an opening diameter adjustment mechanism for adjusting the size of the opening diameter of the cable insertion hole.

2. The opening diameter adjustment mechanism includes: a rotating ring member rotatable about a central axis of the cable insertion hole; a pair of upper and lower linear motion ring members respectively provided on the upper and lower sides of the rotating ring member and slidable along a central axis of the cable insertion hole; a pair of upper and lower cloth members each having both ends fixed to the linear motion ring member and the rotary ring member and provided to cover the linear motion ring member and the rotary ring member; Equipped with The pair of upper and lower cable insertion holes are formed by the pair of upper and lower fabric members, 2. The container according to claim 1, wherein the opening diameters of the pair of upper and lower cable insertion holes can be adjusted simultaneously by rotating the rotary ring member.

3. 3. The container according to claim 2, wherein the rotating ring member is provided with a gas inlet for allowing a purge gas to flow into the interior of the rotating ring member.

4. 4. The container according to claim 2 or 3, wherein the rotating ring member, the linear motion ring member and the fabric member are each splittable into two from a closed ring state to an open ring state.

5. The opening diameter adjustment mechanism includes: an annular main body member having the cable insertion hole at a center portion; A pair of left and right plate-shaped seal members each provided on an upper side and a lower side of the main body member so as to be openable and closable; a spring member that biases the pair of left and right seal members in a direction to close the pair of left and right seal members toward a center portion; Equipped with The cable insertion hole is formed in the center of the pair of left and right seal members, 2. The container according to claim 1, wherein the opening diameter of the cable insertion hole is adjustable by moving the pair of left and right seal members in an opening direction against the elastic force of the spring member.

6. 6. The container of claim 5, wherein the body member is provided with a gas inlet for admitting a purge gas into the interior of the body member.

7. 7. The container according to claim 5, wherein the main body member is splittable into two in a direction in which the pair of left and right seal members open.

8. a glove box provided inside the container and configured to allow a user to insert their hands from outside the container to operate the stuffing box member; an access window disposed near the glove box and the stuffing box member so that the glove box and the stuffing box member can be viewed from outside the container; A container according to any one of claims 1 to 7, comprising:

9. A liquefied gas pump; A container according to any one of claims 1 to 8; A pump system comprising:

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